Cheapest return flights from Ontario to San Juan in January from $390

AirHint found the following cheapest return flights from Ontario (ONT) to San Juan (SJU) in January 2026 (see full year).

Return flights

26 Jan - 31 Jan Southwest Airlines
25 Jan - 01 Feb Southwest Airlines
16 Jan - 20 Jan Southwest Airlines
18 Jan - 25 Jan Southwest Airlines
23 Jan - 25 Jan Southwest Airlines
22 Jan - 26 Jan Southwest Airlines
18 Jan - 01 Feb Southwest Airlines
11 Jan - 25 Jan Southwest Airlines
05 Jan - 12 Jan Southwest Airlines
25 Jan - 08 Feb Southwest Airlines
15 Jan - 19 Jan Southwest Airlines
09 Jan - 12 Jan Southwest Airlines
08 Jan - 13 Jan Southwest Airlines

Also check the deals for one-way flights from Ontario to San Juan in January.

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